.form-input {
  flex: 1;
  height: 4.5rem;

  > div:nth-child(2) {
    margin-top: 0.1rem;
    margin-left: 1rem;
    height: 1.5rem;
    color: var(--red-40);
  }

  /* 动画定义 */
  .error-message {
    opacity: 1;
    transition: opacity 0.3s ease-out;
  }

  .error-message.exit {
    opacity: 0;
  }
}